Well No. 5 and Water Treatment Plant - Fox Lake, IL
The Village of Fox Lake contracted with Clark Dietz to investigate the possibility of constructing a fifth sand and gravel well. Clark Dietz designed and installed a test well in the desired location to verify the supply capacity of the local formation. Test pumping results indicated that the local geologic formation was able to maintain a steady supply of water at 750 gallons per minute (gpm). A water quality analysis showed the presence of iron at a concentration of 1.27 mg/L, prompting the need for iron removal when the final well was constructed.
Clark Dietz investigated gravity filtration and pressure filtration systems for iron removal. Considerations included the size of the treatment system and equipment in relation to available space; ease of use for plant personnel conducting day‑to-day operation and maintenance; expense, including capital and annual operating costs; and impact on the surrounding neighborhood.
With the location in a residential neighborhood, it was important that the treatment facility be designed in such a way as to blend in with the surrounding homes. Noise was also an issue. Clark Dietz engineers designed a pressure filtration system which increased the ability to mask mechanical noises inside the building from the treatment system, as well as outside.
Groundwater is pumped from Well No. 5 via a submersible pump rated for 800 gpm at 500 feet of Total Design Head (TDH), to the pressure filtration system. The raw water is piped to the top of the filtration unit and forced through atomizing spray nozzles. The nozzles break up the raw water and oxidize any soluble iron that may be present as well as any undesirable gases and odors. As the raw water is being aerated, it travels over aluminum trays that break up the water even more, and then it flows into the filter chamber. The filter chamber houses the filtration media used to remove any insoluble iron that is present in the water, leaving iron concentrations below the state and federal maximum contaminant levels - typically between 0.05 mg/L and 0.1 mg/L.